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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I have been using Ubuntu for a year now. I am all happy with it, but Ubuntu 11.04 messed some things.

I am a student of Java, and use it every day. whereas it worked fine before, since my recent upgrade, compiling files works just fine, but running them won't work fine. instead of running java files with just a 'java FileName', now I need to add a sudo as follows: 'sudo java FileName'. is there any way I can make sure my computer runs java files without requesting the sudo command? how do I go about that?

Note that in my case, the read/execute bits are set for user, group, and other. If you are missing the "other" bits, you will be forced to use sudo. Remember that to execute a file, you must be able to read it: thus the read and execute bits. In my system's case, I would use the following command: